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A041755
Denominators of continued fraction convergents to sqrt(397).
2
1, 1, 13, 40, 173, 1597, 1770, 5137, 6907, 18951, 25858, 44809, 115476, 160285, 436046, 596331, 5803025, 23808431, 77228318, 950548247, 1027776565, 40006057717, 41033834282, 532412069101, 1638270041585, 7085492235441, 65407700160554, 72493192395995
OFFSET
0,3
LINKS
Index entries for linear recurrences with constant coefficients, signature (0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 40956605964, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1).
FORMULA
a(n) = 40956605964*a(n-21) + a(n-42) for n>41. - Vincenzo Librandi, Dec 24 2013
MATHEMATICA
Denominator[Convergents[Sqrt[397], 30]] (* Vincenzo Librandi, Dec 24 2013 *)
CROSSREFS
Cf. A041754.
Sequence in context: A220083 A041326 A319088 * A229768 A251100 A044968
KEYWORD
nonn,frac,easy
AUTHOR
EXTENSIONS
More terms from Vincenzo Librandi, Dec 24 2013
STATUS
approved